Suction silencer for internal combustion engines



F. NEWTON Jan. 21, 1941.

SUCTION SILENCER FOR INTERNAL COMBUSTION ENGINES Filed March 2'7, 1939 INVENTOR ATTORNEYS Patented Jan. 21, 1941 UNITED STATES PATENT OFFICE SUCTION SILENCER FOR INTERNAL COMBUSTION ENGINES Frank Newton, Monterey, Calif.

Appiication March 27, 1939, Serial No. 264,501

Claims. (01. 18151) My invention relates to improvements in an foraminated transverse closure walls l9, which apparatus for muffling and purifying exhaust are here illustrated as being two in number, gases. however, it is to be understood that any number An important object of my invention is to desired may be used. The walls l9 are spaced 5 provide amufiler for rendering harmless the toxic progressively closer together as they approach 5 gases of the exhaust of an internal combustion the outlet pipe I8 so that the compartments 20,

engine, 2| and 22 therebetween will become progressively Another object of my invention is the provision smaller. of a mufiler for purifying the exhaust gases and The heat conducting or ventilating tube 23 is o for subduing the exhaustive discharge thereof. positioned longitudinally of the body portion and Yet another object of my invention is to proin appressed relation with the inner periphery vide a muliier that will substantially reduce the thereof. The tube 23 is received by aligning back pressure in the exhausting system of the Openings in the end walls l3 and 4 and inter- \ehicle. mediate walls l9, and the end 24 thereof ter- 1 Still another object of my invention is to prominates flush with the outer plane of the end vide a mufiler that is durable in its construction wall l4 and communicative with the atmosphere and efficient in its operation. exteriorly of the body portion Ill. The end 25 Other objects and advantages of my invention of the tube 23 projects longitudinally beyond the will be apparent during the course of the followend wall l3 and the open extremity 26 thereof ing description. is bent downwardly at substantial right angles 20 In the drawing, forming a part of .this specifithereto as clearly illustrated in Figure 1. The cation, and in which like numerals are employed inner diameter of the tube 23 is struck inwardly,

to designate like parts through the same, as at 21, within the compartment 2| to form an Figure 1 is a longitudinal sectional View of a opening 28 therein which will afford communicadevice embodying my invention, tion between the ventilating tube and the in- 25 Figure 2 is a vertical sectional view, taken on terior of the body portion H]. th i 2-2 f Figure 1, The operation of my device is as follows:

Figure 3 is a vertical sectional view, similar The exhaust gases are introduced into the comto Figure 2, but showing a slight modification partment 20 of the body portion In throug the 30 g pipe H, as indicated by the arrows in Figure 1. 30

Figure 4 is a longitudinal sectional view of The compartment 20 is the largest of the three another form of my invention, compartments 2%), 2| and 22, and as the gases Figure 5 is a perspective view, showing parts imp nge against the first closure Wall I9, the broken away of yet another form of my invention, Velocity of the same will be substantially deand creased. As the gases and heat pass into the 35 Figure 5 is a fragmentary vertical sectional second compartment 2| a portion of the heat view, taken on the line B--B of Figure 4. from the gases will flow through the opening 28 In the accompanying drawing, wherein for the and into the Ventilating tube 23. The removal of purpose of illustration, are shown preferred exa q a tity of heat f o e gases in this com-- amples of my invention, the numeral l0 desigpartment will result in a decrease in the pressure 40 hates a substantially tubular body portion having of the gases therein. The removal of th heat either end H and I2 thereof formed with trans and the consequential reduction in pressure will verse closure walls l3 and M which are formed result in a partial vacuum being formed within with centrally located bosses l5 and IS. The the body portion I0 and cool air will consequently 5 inlet pipe comprising a portion of the exhaust rush in through the opening 29 of the ventilating 5 pipe leading from the manifold of the internal tube 23. As soon as the air begins to enter combustion engine (not shown), is received by through e p 29 0 t e e t a tube, the boss it and communicates with the interior a certain amount of heat will be absorbed from of the tubular body portion H! but terminates the compartment 2|, resulting in a reduction in flush with the inner face of the wall M. An t e p s o the gases therein The 0001 60 outlet pipe |8, comprising a continuation of the entering the opening 29 will join the heated gases exhaust pipe, is carried by the boss |'5 and comflowing through the opening 28 and will submunicates with the interior of the body portion stantially cool the same sufficiently to absorb adbut terminates flush with the inner face of the ditional heat from the gases remaining within p5 wall l3. The body portion I0 is provided with the intermediate compartment 2|. This will result in a further reduction of the pressure of the gases within this compartment. The closure walls l9 substantially reduce the velocity of the gases to permit the cool air in the ventilating tube to efiect a substantial decrease in the pressure of the gases within the body portions It. By the time the gases have reached the last and smallest chamber 22 they will be greatly cooled and therefore reduced in pressure, and will be discharged through the pipe 18 under such reduced pressure as to be practically noiseless.

It may thus be seen that by directing a portion of the heat from the exhaust gases into the tube 23 in a manner whereby a suction is created to draw cool air through the opening 29, additional heat will be absorbed from the gases within the body portion i0 and the substantial cooling will effect a consequential reduction in pressure sum-- cient to prevent a back pressure from building up within the body portion ID to prevent the complete scavenging of the cylinder at every stroke of the piston. This will greatly increase the efiiciency of the vehicle, and effect a more complete scavenging in the combustion chamber of the carbon dioxide gas, thereby permitting a more complete combustion of the fuel and removing one great cause of incomplete combustion as well as eliminating a large volume of carbon monoxide.

In the form of the invention, as illustrated in Figure 3, I have provided a plurality of the longitudinally extending ventilating tubes 23 spaced equally about the inner periphery of the body portion It. The operation of this form of the invention is so similar to the form hereinabove described that no further explanation is thought to be necessary. It will be obvious, however, that the cooling effect will be greatly increased by the addition of the greater number of tubes. This form of the invention is particularly adapted to be used in association with an airplane, or the like, where a comparatively great cooling effect is necessary.

In the form of the invention, as illustrated in Figure l, the tube 23 has a substantially smaller tube 39 disposed centrally therein and terminating a substantial distance from the end 29 thereof. The end 3! of the inner tube 30 is flared outwardly, as illustrated in Figure 4, and the end 32 thereof is provided with radially projecting ears 33 which engage the inner periphery of the tube 23. The segmental slots 34 are formed between the ears 33, and permit a passage of the heated gases within the three compartments 259, El and 22 to pass through the ports 35 in the ventilating tube 23 and to flow through the segmental slots 34 between the end 32 of the inner pipe and the inner periphery of the ventilating tube 23. The reduction of pressure interiorly of the body portion II] will cause cool air to be drawn in the end 3| of the tube 30, and a substantial cooling of the gases and a consequential reduction in the presence of the gases within the body portion will be effected, in the same manner hereinbefore described.

In the form of the invention, as illustrated in Figure 5, the tube 23 is formed with a longitudinally extending, horizontally disposed, wall 36 that divides the end 24 of the tube into an upper compartment 38 and a lower compartment 39. The end 24 of the upper compartment 38 is provided with an end closure Wall 31 which prevents atmospheric communication with the upper compartment 38. The lower compartment 39 is free to communicate with the atmosphere.

The upper surface of the tube 23 is provided with a plurality of apertures 40, through which the heated gases from within the body portion ID may pass. As the gases flow toward the rearward end 25 of the ventilating tube, the cooling air will be drawn in through the lower end of the compartment 39 to perform the same function as hereinbefore described.

It is to be understood that the forms of my invention, herewith shown and described, are to be taken as preferred examples of the same, and that various changes in the size, shape and arrangement of parts may be resorted to without departing from the spirit of my invention, or the scope of the appended claims.

Having thus described my invention, I claim:

1. A muffier comprising a tubular body having transverse closure walls at either end thereof adapted to centrally receive portions of an exhaust pipe in a manner whereby exhaust gases will longitudinally traverse the body; a plurality of foraminated transverse partitions intermediate the end walls dividing the said body into chambers; and a tubular member extending through the body and said partitions laterally of the longitudinal axis of the body, the ends of the said tubular member opening through the end closure walls and communicating with the atmosphere and an intermediate portion thereof opening into at least one of the said compartments.

2. A mufiier comprising a tubular body portion having transverse closure walls at its opposite ends adapted to centrally receive portions of an exhaust pipe in a manner whereby heated ex haust gases will longitudinally traverse the body for its entire length; a plurality of foraminated partitions dividing the said body into chambers; a tubular member received by the body laterally of the longitudinal axis thereof, the ends of the said member opening through the end closure walls of the body and having communication with the atmosphere, an intermediate portion of the member communicating with the chambers of the body intermediate its ends in a manner whereby a rapidly flowing stream of substantially cool atmospheric air may longitudinally traverse the tubular member to cool the heated exhaust gases in the body by heat absorption and to create a suction to draw a portion of the gases from the said body.

3. A muffler comprising a tubular body having transverse closure walls at either end thereof adapted to receive portions of an exhaust pipe in a manner whereby exhaust gases will longitudinally traverse the body; a plurality of foraminated transverse partitions intermediate the end walls and dividing the said body into chambers; and a plurality of spaced tubular members positioned circumferentially around the said body and concentrically of the longitudinal axis thereof, the opposite ends of the tubular members operating through the end walls of the body and communicating with the atmosphere, each of the tubular members communicating with at least one of the said compartments at a point intermediate the ends thereof whereby a rapidly flowing stream of atmospheric air may longitudinally traverse each of the tubular members to create a suction to draw a portion of the exhaust gases from the body.

4. A mufller comprising a tubular body having closed ends adapted to receive portions of an exhaust pipe in a manner whereby heated exhaust gases will longitudinally traverse the body for its entire length;-foraminated transverse partitions dividing the body into a plurality of chambers of progressively decreasing size toward the exhaust discharge end of the body; a perforated tubular member extending longitudinally through the body and partitions laterally of the longitudinal axis of the body and with the opposite ends thereof opening through the closed ends of the body; and a second imperforate tubular member disposed coaxially within the first tubular member and adapted to be longitudinally traversed by a stream of atmospheric air, the entrance end of the second tubular member being formed to seal the corresponding end of the first tubular member and the discharge end thereof being formed to permit passage of exhaust gases from the body through the discharge end of the first tubular member, whereby the rapid flow of atmospheric air through the second tubular member will create a suction to draw gases from the body.

5. A muffler comprising a tubular body having closed ends adapted to receive portions of an exhaust pipe in a manner whereby the heated exhaust gases will longitudinally traverse the body for its entire length, foraminated transverse partitions dividing the body into a plurality of chambers of progressively decreasing size toward the exhaust discharge end of the body, a tubular member extending longitudinally through the body and partitions laterally of the longitudinal axis of the body and with its opposite ends opening through the closed ends of the body, a partition received by the tubular member for dividing the same into an upper and a lower passage, the end of the upper passage at the inlet end of the body being closed and the portion of the tubular member enclosing the upper passage being perforate to permit the heated gases in the body to have access thereto, the lower passage being open at its ends to permit a stream of comparatively cool atmospheric air to longitudinally traverse the same to cool the heated gases in the upper chamber and body by heat absorption and to create a suction to draw a portion of the exhaust gases from the said body.

FRANK NEWTON. 

